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Young Stars and Ionized Nebulae in M83: Comparing Chemical Abundances at High Metallicity.
Bresolin, Fabio; Kudritzki, Rolf-Peter; Urbaneja, Miguel A. +3 more
We present spectra of 14 A-type supergiants in the metal-rich spiral galaxy M83. We derive stellar parameters and metallicities and measure a spectroscopic distance modulus µ =28.47+/- 0.10 (4.9 ± 0.2 Mpc), in agreement with other methods. We use the stellar characteristic metallicity of M83 and other systems to discuss a version of the gala…
A Hubble Space Telescope survey of the host galaxies of Superluminous Supernovae
Lyman, J. D.; Angus, C. R.; Fruchter, A. S. +4 more
We present Hubble Space Telescope (HST) Wide Field Camera 3 UV and near-IR (nIR) imaging of 21 Superluminous Supernovae (SLSNe) host galaxies, providing a sensitive probe of star formation and stellar mass within the hosts. Comparing the photometric and morphological properties of these host galaxies with those of core-collapse supernovae (CCSNe) …
First Results from the MADCASH Survey: A Faint Dwarf Galaxy Companion to the Low-mass Spiral Galaxy NGC 2403 at 3.2 Mpc
Bell, Eric F.; Forbes, Duncan A.; Romanowsky, Aaron J. +13 more
We report the discovery of the faintest known dwarf galaxy satellite of a Large Magellanic Cloud (LMC) stellar-mass host beyond the Local Group (LG), based on deep imaging with Subaru/Hyper Suprime-Cam. Magellanic Analog Dwarf Companions And Stellar Halos (MADCASH) J074238+652501-dw lies ∼35 kpc in projection from NGC 2403, a dwarf spiral galaxy a…
A spectroscopic survey of X-ray-selected AGNs in the northern XMM-XXL field
Georgakakis, A.; Salvato, M.; Buchner, J. +10 more
This paper presents a survey of X-ray-selected active galactic nuclei (AGNs) with optical spectroscopic follow-up in a ∼ 18 deg2 area of the equatorial XMM-XXL north field. A sample of 8445 point-like X-ray sources detected by XMM-Newton above a limiting flux of F_{0.5-10 keV} > 10^{-15} erg cm^{-2} s^{-1} was matched to optical (Slo…
A Deep Search for Faint Galaxies Associated with Very Low Redshift C IV Absorbers. III. The Mass- and Environment-dependent Circumgalactic Medium
Tripp, Todd M.; Prochaska, J. Xavier; Tumlinson, Jason +6 more
Using Hubble Space Telescope Cosmic Origins Spectrograph observations of 89 QSO sightlines through the Sloan Digital Sky Survey footprint, we study the relationships between C IV absorption systems and the properties of nearby galaxies, as well as the large-scale environment. To maintain sensitivity to very faint galaxies, we restrict our sample t…
BICEP2/Keck Array VIII: Measurement of Gravitational Lensing from Large-scale B-mode Polarization
Ade, P. A. R.; Bock, J. J.; Crill, B. P. +62 more
We present measurements of polarization lensing using the 150 GHz maps, which include all data taken by the BICEP2 and Keck Array Cosmic Microwave Background polarization experiments up to and including the 2014 observing season (BK14). Despite their modest angular resolution (∼ 0.5°), the excellent sensitivity (∼3µK-arcmin) of these maps ma…
The Impact of Non-uniform Thermal Structure on the Interpretation of Exoplanet Emission Spectra
Fortney, Jonathan J.; Stevenson, Kevin B.; Bean, Jacob +4 more
The determination of atmospheric structure and molecular abundances of planetary atmospheres via spectroscopy involves direct comparisons between models and data. While varying in sophistication, most model spectra comparisons fundamentally assume one-dimensional (1D) model physics. However, knowledge from general circulation models and of solar s…
The Nuclear Cluster of the Milky Way: Total Mass and Luminosity
Genzel, R.; Gillessen, S.; Eisenhauer, F. +6 more
We obtain the basic properties of the nuclear cluster of the Milky Way. First, we investigate the structural properties by constructing a stellar density map of the central 1000″ using extinction-corrected old star counts from VISTA, WFC3/IR, and VLT/NACO data. We describe the data using two components. The inner, slightly flattened (axis ratio of…
Non-parametric analysis of the rest-frame UV sizes and morphological disturbance amongst L* galaxies at 4 < z < 8
Ferguson, H. C.; McLure, R. J.; Dunlop, J. S. +12 more
We present the results of a study investigating the sizes and morphologies of redshift 4 < z < 8 galaxies in the CANDELS (Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey) GOODS-S (Great Observatories Origins Deep Survey southern field), HUDF (Hubble Ultra-Deep Field) and HUDF parallel fields. Based on non-parametric measuremen…
Positron annihilation signatures associated with the outburst of the microquasar V404 Cygni
Beloborodov, Andrei M.; Diehl, Roland; Greiner, Jochen +7 more
Microquasars are stellar-mass black holes accreting matter from a companion star and ejecting plasma jets at almost the speed of light. They are analogues of quasars that contain supermassive black holes of 106 to 1010 solar masses. Accretion in microquasars varies on much shorter timescales than in quasars and occasionally p…